Fix git_describe massaging (#35)

tildamk6/mpconfigboard.cmake

@@ -1,13 +1,7 @@
 set(IDF_TARGET esp32s3)
 
-git_describe("TIDAL_GIT_VERSION" "${MICROPY_PORT_DIR}/../../../")
-if(TIDAL_GIT_VERSION MATCHES "\\-dirty$")
-    # Our build process always dirties submodules, so it's not worth stating
-    # (And it's easier to strip here than fork git_describe())
-    string(LENGTH "${TIDAL_GIT_VERSION}" strlen)
-    math(EXPR strlen "${strlen} - 7")
-    string(SUBSTRING "${TIDAL_GIT_VERSION}" 0 ${strlen} TIDAL_GIT_VERSION)
-endif()
+# Override the --dirty set by git_describe, because our build process always dirties submodules so it's not worth remarking on
+git_describe("TIDAL_GIT_VERSION" "${MICROPY_PORT_DIR}/../../../" --dirty=)
 message("TIDAL_GIT_VERSION=${TIDAL_GIT_VERSION}")
 configure_file("${MICROPY_PORT_DIR}/boards/tildamk6/sdkconfig.project_ver.in" "${MICROPY_PORT_DIR}/build-tildamk6/sdkconfig.project_ver")
 if(DEFINED ENV{CONFIG_TIDAL_VARIANT_DEVBOARD})